We built our Koi pond a few years ago....and have never regretted the decision. I have had my ups and downs and even had a few disappointments learning how to keep the water level consistent, clean and clear. The moral of the story...buy twice the pump and twice the filter that you believe you need. If these two components are inadequate, the results are immediate and frustrating. I was fortunate that I could reuse one of the smaller pumps in a waterfall and quickly sold my too small Laguna Pressure-Flo on www.craigslist.com.
The BIG Beginning!